Is it possible I have border personality disorder?

Ever since I can remember I have been a very 'emotional' person. I feel everything extremely intensely, especially anger. I can fly into a rage very quickly and this mood fluctuates being anger, depression and a sense of emptiness, it can last days sometimes. I also cannot deal with my partner leaving me on my own. I go through the same emotions and usually call them and text them loads and create a nasty argument. I am really struggling with this and I have been for a while. I have a friend who is very similar to me and we have both been through traumatic, abusive relationships in the past and issues with abandonment from parents. I find it hard to keep friendships and general relationships as I will go from liking/loving someone to hating them and not being able to communicate my feelings with feeling like people think I'm crazy.

I have a doctors appointment on Tuesday to talk about this and have previously been in therapy (I am waiting for this to start again). I feel like I am crazy and controlling (not all the time we usually have a pleasant relationship which is very loving) and mean to my partner and it's unfair but I am really struggling and feel like I am constantly being thrown around by my emotions.

I just want some advice or to know if anyone has experienced something similar?